ESSEX Police are appealing for witnesses after an assault inside Subway at intu Lakeside , Thursday 29 August.
It was reported that a teenage boy was attacked with a metal baseball bat shortly before 5.45pm. He is believed to have suffered serious injuries.
Officers attended and arrested a 13-year-old boy on suspicion of causing grievous bodily harm and possession of an offensive weapon in a public place.
He remains in custody for questioning.
Anyone with information about the incident is asked to call Grays CID on 101 quoting the incident number 1060 of 29 August.
Alternatively, you can call Crimestoppers 100% anonymously on 0800 555 111 or submit an anonymous report through their online form.